GMMG chambered on a TPI

Anyone have or heard.
Just curious.

Try www.ls1sounds.com

They have ALL KINDS of exhaust notes.. the GMMP's are ESPECIALLY nice;)

yeah thas a good site, but they most only have exhaust on a LS1 cars. Its gonna sound different on an L98 than it would on an LS1

Yeah thats why I asked.
I've heard it on several LS1s.
Its badass. I choose Corsa for mine
but when I pick up another 3rd gen
I want it to sound as mean as possible.

Originally posted by locosteelersfan
Yeah thats why I asked.
I've heard it on several LS1s.
Its badass. I choose Corsa for mine
but when I pick up another 3rd gen
I want it to sound as mean as possible.

Well most GM people I talk to agree gen I sbcs sound genrally more badass than LS1s, so chances are if yuo think teh chambered exhuast sounds good on an LS1, your gonna like it more on an L98.

Alot of people complain that LS1s are too quiet.
GM actually had it as one of the design goals going
into Gen III. Corvettes are becoming more and
more refined so they don't really the motor to be
all that loud. Its going to be interesting hearing
the LS2

Darth, got any pics of that car. Looks like a
steelers edition.

My bad.. I thought we were talking about your LS1 Loco.. dunno how it would sound on an L98.

Corsa's are also badass..

I've heard GMMG on an LT1 both before and after a cam install, and it sounded good both ways, better after the cam. I am going to try and rig up a loudmouth exhaust with dual chambered mufflers in place of the resonator. Should sound similar I am hoping, I cannot afford to fork out the 800 for a GMMG system. But the sound is incredible

Will

Originally posted by stanghunter211
I've heard GMMG on an LT1 both before and after a cam install, and it sounded good both ways, better after the cam. I am going to try and rig up a loudmouth exhaust with dual chambered mufflers in place of the resonator. Should sound similar I am hoping, I cannot afford to fork out the 800 for a GMMG system. But the sound is incredible

Will

hey, check over at ls1tech.com
they got a gp going on and if/when it get's approved, it will be $600 for the standard system (slash tips) and 725 for the oval tip system

The L98 would sound pretty similar to the LT1 if you had similar compression ratio and a similar cam.

Stock L98's don't really sound that great with a cutout or straight exhaust, compared to a stock LT1.

LS1 sounds worst of them all ;)

A stock LT1 with cutout sounds badass.

For anyone that is wondering, the dynomax bullets sound good when under load on the 3rd gens, but you put that on an ls1 car and it sounds like ass.

I love the cutout on my L98, and I have had several LS1 as well as LT1 guys tell me how nice it sounded, and wished their cars sounded that deep at idle. Just my opinion though. Still 600 is alot for a catback, I will have to see if funds become available. Too bad they can't do away with the tips all together and knock off some more dough

Will

I use a pair of Stainless Works chambered mufflers (custom length) on a 2-1/2" true dual system. For pics. click on "SC Z!!" in my sig, then on "Exhaust". For a sound clip, go to:

http://www.iroc-zpostforum.com/MemberWillie.htm

Tell me if you've ever heard a 305 TPI sound like mine!

I like the sound of the L98 more than the LT1 and LS1. Although the LT1 does sound better than the LS1. (they really need to do something about the sound of the new engines, that all-out muscular Chevrolet sound/rumble just isn't there)

I think that exhaust would sound great on a 350 TPI. Even better if it were true dual like Willie's. Willie, do you intend to get more or better video's/sound files?

Sounds good man, I am gonna get some chambered mufflers on there if it kills me. How much did it run you to have that rear section fabbed up. I really want to mount it there, but I could live with it under the car

Will

Why do LS1's sound like such crap? What is so diff. about them?
What kind of fuel-delivery system does and LS1 and LT1 have? I have been told it was MPI.. but always thought it was TPI until I have read this thread and really thought about it...

Lt1's are basically just short runner TPI setups, where as LS1s are completely apart. Plus the LS1's have a totally different firing order than the standard SBC. Actually its said to be the same as ford, which explains why LS1's are closest sounding chevy motor to a mustang. I think they sound great. Nothing wrong with an LS1 sound

Will

Originally posted by 85_305
Why do LS1's sound like such crap? What is so diff. about them?
What kind of fuel-delivery system does and LS1 and LT1 have? I have been told it was MPI.. but always thought it was TPI until I have read this thread and really thought about it...

i think the ls1's (or lsx's really since they have mroe coming) sound different just because (like stanghunter211 said) they have a different firing order and also because they're blocks are aluminum, whereas tpi and lt1 setups are cast iron

where as LS1s are completely apart

How are they completely apart.. are they MPI or no?

What the block is made up of, and the firing order are gonna alter the freakin' exhaust note?? Why?

What is a TPI setup.. long-runner or short runner?
LT1's are always short-runner?

TPI has a LOOOOONG runner.

Like I said before though LS1's had a
noise tolerance limit set during development.
They were made to be quiet.

Yes, changing the firing order will affect the sound emitted. Also LS1's are a completely different design of motor. They have nothing in common with any previous SBC except maybe the fact that gm went back to a belt driven water pump after the LT1's design.

noise tolerance limit set during development.They were made to be quiet.

How were these "noise tolerances" created though.. how do you "make" something to be quiet, except for maybe an exhaust?

TPI has a LOOOOONG runner.

What is the relationship between runner length, and performance?

Yes, changing the firing order will affect the sound emitted. Also LS1's are a completely different design of motor. They have nothing in common with any previous SBC except maybe the fact that gm went back to a belt driven water pump after the LT1's design.

How does firing order affect the "sound" of an engine? How are LS1's a completely diff. designed motor?

Come on man, go to the LS1 tech section and ask maybe they can answer you. Its alluminum for one, second the heads are redesigned, they won't fit a standard sbc, the block is not compatible with any sbc parts, the intake manifold is totally different, it uses coil packs instead of a distributor.... ITS JUST DIFFERENT

Long runner design equates to more low end torque and loss of high end hp, which is why most lightly modded L98's will take an equally modded LT1 off the line, but the LT1 will catch up and pass about half track down the 1/4 mile

And firing order does affect sound, I don't know how, but it does, i've heard the difference

Will

Come on man, go to the LS1 tech section and ask maybe they can answer you

Sorry.. it's just we were talking about it on here, and I had like.. 60 seconds total time to read and reply, as I had stuff to get done.

Thanx for the explanations though, Will.. I will try to use the appropriate forum next time for my question.

Matt

Nah, just seems like you have some good questions that would be more thoroughly answered in the LS1 tech section, I don't know much about the LSx engines, and those guys do! Good luck

Will

Well, you, as well as the other guys, knew what ya'z were talking about, so I figured I would just keep asking (lol). But I get your point.. thanx again.

Yes exhaust will effect it-every part from manifold back
but also things like cam/valvetrain

Why can't an LS1 be totally different. Just like a
Chevy 5.0 305 is different than a ford 5.0 302.
LS1 has a different block, totally different design
with bank to bank flow, dry sumps, main bolts.
LS1 is Aluminum. LS1 has totally different bore and
stroke=346CID not 350. Different pistons,valves, pushrods
etc, etc, etc. It be easier to name one thing in common with
TPI. YES is in multi port-pretty much every thing is now.
TPI was realitily new at the time which is why it is so
seen on the car. EFI is almost always listed as tuned anymore.

Runner length is generally associated with low end TQ
TPI is 26" give or take. LT1 is 3". So it seems LT1
would be a higher runner yet the knock on LS1 is less
low end TQ of the 3 while its runner is 16".
Its been awhile since I read those #'s but I know they're close.
The point is there are alot of other factors. And as everyone
whos had a TPI knows the knock is you can't fill them fast
enough at high RPM so the car doesn't pull strong to the redline
while LS1's get scarier and scarier as the RPMs soar.

every part from manifold back

I knew the Cam can change it.. but how does the manifold change it?

I always thought that the MPI Camaro's were crap.. were they?

the knock is you can't fill them fast

No matter what you do?

How is MPFI crap? Most systems are that, unless its some rail direct or other efi setup. Are you talking about those gay 2.8L MPFI camaros back in the 80's that had that badging?

OK any change in shape, size, or WHATEVER will change exhaust sound. There are ways to optimize exhaust flow and power w/o increasing sound levels. Its been this way for years and years.

And there are ways to get more top end out of em, IE change the runners to a shorter SLP or Accel style runner. But they will never be as effective in the top end as say an LT1 unless you do away with the TPI completely and switch to stealthram or superram. It costs way too much to get minimal benefits from porting on a stock TPI. You could get much more power up top from an aftermarket system

Will

Are you talking about those gay 2.8L MPFI camaros back in the 80's that had that badging

No, I think they are 305's, maybe 350's, from the mid-80's to the early 90's.. but I am unsure.

rail direct

Rail Direct is crap? What do the LS1's use?

OK any change in shape, size, or WHATEVER will change exhaust sound

Thanx for clarifying that.. now it makes a bit more sense.

stealthram or superram

What kind of Fuel Injection are these 2?

The Stealthram and Superram are both TPI-based systems (as in they use the TPI computer, wiring, sensors, ignition setup, etc.) The physical size and shape of the intake is what's different. They have much larger diameter runners so they don't choke off the flow of incoming air, which provides more horsepower at high rpm's.

which provides more horsepower at high rpm's.

Yet still have low-end grunt, right?